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  • Wiley-Blackwell  (6)
  • Cambridge University Press
  • 1985-1989  (4)
  • 1970-1974  (2)
  • 1955-1959
  • 1935-1939
  • 1986  (4)
  • 1974  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Phase transitions and defect structure in the lamellar surface of polyethylene and n-alkane crystallites. Magic angle spinning 13C NMR studiesHerrn Professor Dr. R. Kosfeld zum 60. Geburtstag gewidmet (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1237-1252 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Variable temperature magic angle spinning 13C NMR experiments on linear alkanes and low molecular weight polyethylene allowed the observation of up to six carbon atoms at the chain ends near the surface of the lamellar crystallites. Conformational order-disorder and intermolecular packing effects are reflected by the spectra. The effects are discussed with regard to the peculiar phase behaviour of the n-alkanes and the fringed micella model for low molecular weight polyethylene. The solid-solid transitions of nonadecane and hexatriacontane appear to be correlated with the occurrence of specific non-liquid-like conformational disordering. Thus, conformational defects were observed for the “rotator phase” which depend on the chain length and which vary along the chain. Whilst the center part of the chain remains all-trans ordered, significant gauche defects were observed for the bonds at the chain ends. For a polydisperse low molecular weight linear polyethylene as well as for monodisperse octahexacontahectane reversible liquid-like conformational disordering of the terminal chain segments could be detected when the melting point was approached. Hence, in this case the NMR spectra indicate pre-melting of the lamella surface, while in case of the shorter n-alkanes the occurrence of end-gauche defects is correlated with solid-solid transitions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870520
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  • 2
    Electronic Resource
    Electronic Resource
    Liquid chromatographic-mass spectrometric analysis of 2-nitrofluorene and its derivatives (1986)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 681-688 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid chromatography-mass spectrometry (LC-MS) with a nebuliser and a moving belt was used to characterise 2-nitrofluorene, its metabolites and related compounds. In total, 18 different compounds were analysed. The LC-MS interface did not affect the chromatographic performance achieved by high performance liquid chromatography (HPLC). The method allowed determination of the positions of the hydroxyl groups in different hydroxylated 2-acetylaminofluorene derivatives. The LC-MS procedure generated acceptable mass spectra with as small amounts of substance as 65 ng. The dose-response curves from the HPLC-detector and the ion-source in the LC-MS were parallel and linear.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200131208
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  • 3
    Electronic Resource
    Electronic Resource
    Isolierung und Struktur von Larreagenin A (1974)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 169-175 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isolation and Structure of Larreagenin AFour glycosides have been isolated from leaves of the central american plant Larreu divaricata Cav.; the structure of one of the aglycons, larreagenin A, has been elucidated by means of 1H-NMR- and 13C-NMR-investigation together with other spectroscopic data as 3β-hydro-xy-29-nor-urs-13(18)-en-20β,28β-olide (4). Larreic acid, isolated from the same plant as glycoside, can be isomerized to larreagenin A.
    Notes: Aus Blättern der mittelamerikanischen Pflanze Lurrea divaricata Cav. wurden 4 Glykoside isoliert; die Struktur eines der Aglyka, das Larreagenin A wurde mit Hilfe von 1H-NMR- und 13C-NMR-Untersuchungen sowie anderer spektroskopischer Daten als 3β-Hydroxy-29-nor-urs-l3(18)-en-20β,28β-olid (4) aufgeklärt. Die aus der gleichen Pflanze als Glykosid isolierte Larreasäure läßt sich zu Larreagenin A isomerisieren.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197419740202
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur von α-CrPO4. Beiträge zum thermischen Verhalten von wasserfreien Phosphaten. I (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 543 (1986), S. 111-116 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions on the Thermal Behaviour of Anhydrous Phosphates. I. Preparation and Structure of α-CrPO4By a chemical transport reaction (1100°C → 1000°C) using chlorine as transporting agent we obtained dark-green, well shaped crystals of α-CrPO4. The compound crystallizes in the space group Imma. The lattice constants are a = 10.403(2), b = 12.898(2), c = 6.299(1) Å. The crystal structure has been determinated from single crystal data and refined to a conventional residual of R = 0.038 (1481 unique reflections, 34 variables). The structure consists of CrO6-octahedra and PO4-tetrahedra. Especially remarkable are pairs of edge sharing CrO6-octahedra which are connected with two PO4-tetrahedra at opposite edges. Parallel to the a- and b-axis are large channels extending through the whole structure.
    Notes: Durch chemischen Transport mit Chlor als Transportmittel (1100°C → 1000°C) erhielten wir dunkelgrüne, gut ausgebildete Kristalle von α-CrPO4. Die Substanz kristallisiert in der Raumgruppe Imma mit a = 10,403(2), b = 12,898(2), c = 6,299(1) Å. Die Kristallstruktur wurde aus Einkristalldaten bestimmt (R = 0,038; 1481 Fo, 34 Variable). α-CrPO4 ist aus CrO6-Oktaedern und PO4-Tetraedern aufgebaut. Bemerkenswert sind kantenverknüpfte CrO6-Oktaeder-Paare, die an gegenüberliegenden Kanten noch mit zwei PO4-Tetraedern verbunden sind. Parallel zur a- und b-Achse verlaufen größere Kanäle.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865431214
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  • 5
    Electronic Resource
    Electronic Resource
    Oberflächenzusammensetzung, Löslichkeit und Ionenaktivitätsprodukt von Calcit in fremdionenhaltigen Lösungen (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 165-178 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Surface Composition, Solubility, and the Ion Activity Product of Calcite in Solutions with Auxiliary IonsUsing the method of simultaneous ion and isotope exchange the chemical composition of the surface layer of calcite powder in equilibrium with solutions of varying Me/Ca molar ratios is determined (Me = Mg2+, Co2+, Ni2+, and Fe2+ ions). The ion exchange isotherms show a marked bend in the surface reactivity when a surface molar ration of ∼1 and ∼3 is reached. The solubility of calcite initially decreases on the addition of Co2+ or Ni2+ ions to the solution whereas it increases in the presence of Mg2+ or Fe2+ ions. The activity product of the pseudo compound, CaxMe(1-x)CO3, decreases in the Ni2+, Co2+ or Fe2+ exchange experiments, however, it increases considerably in those with Mg2+ ions.
    Notes: Mit der Methode des gleichzeitigen Ionen- und Isotopenaustausches wird die chemische Zusammensetzung der Oberfläche eines Calcitpulvers im Gleichgewicht mit Lösungen verschiedener Me/Ca- Verhältnisse bestimmt (Me = Mg2+, Co2+, Ni2+, Fe2+). Alle Austauschisothermen zeigen eine deutliche Änderung der Oberflächenreaktivität, wenn eine Zusammensetzung auf der Oberfläche von (Me/Ca)Obfl.∼1 und ∼3 erreicht wird. Die Löslichkeit des Calcits nimmt anfänglich bei Zugabe von Co2+ oder Ni2+ ab, während sie bei Mg2+ oder Fe2+ im ganzen Bereich der Untersuchung zunimmt. Das Ionenaktivitätsprodukt für die „Pseudoverbindung“ in der Oberfläche nimmt in den Ni2+-, Co2+- und Fe2+-Austauschexperimenten ab, in Gegenwart von Mg2+-Ionen jedoch zu.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100210
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  • 6
    Electronic Resource
    Electronic Resource
    Vorberichte (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 539 (1986), S. 240-240 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865390826
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